Switch for overhead or surface rails or trackage.



D. M. STEWART. SWITCH'FOR OVERHEAD 0R SURFACE RAILS 0R TRACKAGE.

' APPLICATION HLEI) .IUNEZI; 1915- Patented Nov. 30, 1915.

. Mf/zesse'sk D. M. STEWART. swncu ron ovsamn on SURFACE mus on TRACKAGE. APPLICATION FILED JUNEZII I915.-

Patented Nov. 30, 1915.

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MUM-IA PLANOGRAIH L s A, YE m MW m i=1 ia R I T 8. J 6/ DAVID M. STEWART, OFUCALGARY, ALBERTA, CANADA.

SWITCH on OVERHEAD on SURFACE RAILS on TRACKAGE.

Specification of Letters Patent.

Application filed June 21,1915. Serial No. 35,495.

To all whom it may concern Be it known that I, DAVID M. STEWART, a citizen of the Dominion of Canada,residing at Calgary, in the Province of Alberta, in the said Dominion of Canada, a subject of Great Britain, have invented a new and useful Improvement in Switches for Overhead or Surface Rails or Traclrage, of which the following is a specification.

-My invention relates to improvements in switches for overhead or surface rails and is used in combination with a switch of the block type one form of which is described hereinafter. This switch when thrown open leaves one rail open so that any wheel traveling along that rail toward the switch will derail at the switch.

The object of my improvements is to prevent said derailing by a devicewhich works automatically when the switch is thrown open. I attain this object by the mecha nism illustrated in the accompanying drawings in which similar letters refer to similar parts throughout the several views.

Figure 1 is a to view of two pieces of straight steel rail of curved steel rail B and the switch C which is shown closed or in such a position that A and E are joined together by a portion of the switch 0 which acts as a section of the rail; and the mechanism D for which this patent is applied. Fig. 2 is a top view of the same as in Fig. 1 but with the switch C thrown open or in a position in which the rail B is in operation and A and E are separated leaving an open space, E being open except for the mechanism D. The switch C is composed of two heavy pieces of steel hinged together at W and bolted to A at X; when the switch is closed as in Fig. 1 a portion of C forms a rail joining A and E; when thrown open as in Fig. 2 a spaceis left open between A and E and another portion of the switch joins A and B. Fig. 3 is a vertical cross section of the rail E and the mechanism 1); with a truck or traveling hook or crane F (ordinarily used on overhead trackage) showing the mechanism D as is would appear if the switch C were closed as in Fig. 1. Fig. 4 is a vertical cross section of the same as in Fig. 3 but showing the mechanism D as it would appear if the switch C were openas in Fig. 2. Fig. 5 is a vertical side view of the end of the rail E with the mechanism D attached. Fig. 6 is a vertical cross section of the rail E with and E and of'a piece the mechanism attached, the mechanism being in the position in which it would beif the switch. C were open as in Fig. 2. Fig. 7 is a vertical cross section of the rail E with the'mechanism attached and in the position in which it would be if the switch C were closed as in Fig. 1. Fig. 8 is a top view of the rail E with the mechanism in'the position in which it would be if the switch 0 were open as in Fig. 2.

H is a U shaped casting attached by bolts A and B to the sides and bottom of the rail E; J is a lever moving vertically on the pivot K between H and E; L is a triangular piece of steel pivoting horizontally on M;

N is a piece of steel cable attachedto J at Y and to L at O; P is a steel spring fastened rigidlyat R and operating horizontally on S which is a steel post set rigidly,

in L. When the switch C is closed as in Fig. 1 that portion of C which joins A and E rests upon J at the point T and by the weight of C forces J downward so that the point T occupies a position level with the point V on the rail E, thus raising the point Patented Nov. 30, 1915.

Y on J and through the cable N which is A drawn around the steel post Z draws L horizontally until it occupies a position as in Fig. 7 When the switch C is thrown open as in Fig. 2 the weight of the switch C being removed from the point T of the lever- J,

the spring P forces L back to its original position as shown in Fig. 6 and L extending some distance beyond the side of the rail E and the truck or crane F coming along the rail E toward the open switch to the point where L extends beyond the rail E the arm G of the truck F will come in contact with L and the truck will be prevented from proceeding along the rail E and falling off the end of the rail E.

I claim In overhead trackage the combination with two pieces of main track a side track and a block switch controlling the passage of carriers from one piece of main track to the other and from the side track to the main track, of a U shape casting fitted around the bottom and sides of the track rail, and bolted to the said rail near the end laterally beyond the edge of the rail by a spring on the bottom of the U shaped casting and operating on a post set ertically in the chuck block; an arm centrally pivoted on a bolt between one side of the rail and the U shaped casting, one end of the said arm extending slightly beyond and above the open'end of the rail upon which it is attached, the other end of the said arm being attached to the said chuck block by a cable which passes around a post set horizontally in the U shaped casting; the whole being so set that when the switch is thrown over connecting the rail upon which the chuck block is set with one of the other rails a portion of the switch will fall upon the end of the 15 DAVID M. STEWART.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D'. G. 

